Trigger Gmail from subtask completion

I’ve done a lot of searching and can’t find an answer - I want the completion of a subtask to trigger the sending of a Gmail message. Is this possible or is it only available at the task level?

It is not possible to have a rule trigger when a subtask is completed. Either a rule triggers when a task is completed, or when a task or subtask is completed. The trick here is to find a way to:

  • turn those subtasks into tasks (by adding them to another project where the rule lives)
  • or add something on those subtasks only, like a value from a dropdown field, and use this as a condition to your existing rule

Does it help?